My Sister’s Class: Her Little Brother Will Never Graduate

The Male Lead's Nickname Is Ninth Master Xiao (Not the One by Mo Xiner That So Many Readers Recommend)

I read this last year on Fanqie, and it was the first book I read there. I only remember that the male lead's nickname was Young Master Jiu (maybe his surname was Huo, but I can't remember 😄). It was still being serialized last year. He was a cool, domineering young heir, and the female lead was a very resilient girl. I saw it in the comments while scrolling through Douyin videos of my idol.